Management
CMMS, EAM or ERP: which system fixes your maintenance
The difference between a CMMS, an EAM and the ERP maintenance module, the question each one answers and five questions to decide what your team needs.
CMMS, EAM and the ERP maintenance module show up in the same sales presentations, sometimes as if they were the same thing. They aren't. Each one was built to solve a different problem, and choosing by acronym usually ends with an expensive system the shop floor doesn't use.
Three acronyms, three different questions
| System | Question it answers | Main users |
|---|---|---|
| CMMS | What needs to be done today, by whom, and what was done? | Planner, supervisor and technician |
| EAM | What does this asset cost and return over its life, and when should it be replaced? | Asset engineering, management and finance |
| ERP (maintenance module) | How does maintenance fit into the company's accounting, purchasing and inventory? | Finance, purchasing and IT |
In practice the boundaries blur: some CMMS products include cost analysis and some ERPs include work orders. But each one has a different center of gravity, and that is what determines whether the system will serve your team.
CMMS: the maintenance work
A CMMS is built around the work order. Asset register, preventive plans, scheduling, execution, history and operational metrics such as MTBF, MTTR and backlog. It's the tool for people who need tomorrow's preventive task to actually happen.
It works well when the main pain is operational: lost work orders, late preventive maintenance, scattered history, technicians without information in the field.
EAM: the asset from start to finish
EAM widens the view to the entire life cycle: design, purchase, installation, operation, maintenance, overhaul and disposal. It combines maintenance cost, depreciation, risk and performance to answer investment questions: is it worth overhauling or replacing? Which line deserves capital next year?
It makes sense when the company has many high-value assets, several plants and a team that makes investment decisions based on that data. Without that team, the life cycle screens look nice and stay empty.
ERP: maintenance inside the company
The ERP maintenance module exists so the work order can talk to everything else: the part leaves the accounting inventory, the purchase generates a purchase order, the hours become cost in the right cost center. Integration is the big advantage.
The weak spot is usually the field. Screens designed for the office, lots of required fields and little tolerance for poor signal mean the technician fills out the work order later, from memory, or not at all.
A simple rule: the system should be chosen by the people who generate the data, not only by those who read the report. If the technician doesn't record the work, none of the three acronyms will deliver reliable metrics.
How to decide
Answer these five questions before you look at any demos:
- Where does it hurt today? If it's execution (work orders, preventive maintenance, history), start with a CMMS. If it's asset investment decisions, think about EAM.
- How many assets and how many plants? A plant with 300 pieces of equipment rarely needs the EAM layer in the first year.
- Who will record the work? If most of the work happens away from the office, the technician's app and offline capability matter more than any report.
- What needs to be integrated? List the mandatory integrations (inventory, purchasing, costs) and the nice-to-haves. A periodic export often solves what seemed to require full integration.
- How soon does it need to work? Large EAM or ERP projects take months. A well-chosen CMMS can be running with its first work orders in weeks.
The most common path
For most teams, the order that works is: first organize execution with a CMMS, because without reliable history there's nothing to analyze; then integrate what's needed with the ERP; and only then, if the company has the scale and an asset management team, add life cycle analysis.
Skipping steps is tempting and expensive. An EAM implemented on top of an incomplete asset register and work orders with no cause will calculate the life cycle cost of data that doesn't exist. Start with equipment criticality and the cost of downtime per hour: those two numbers alone guide a good share of investment decisions.
taskfield is a CMMS: the focus is execution, from planning to closing the work order in the field, with structured history that can be exported to the company's other systems.
Summary
- A CMMS handles the maintenance work; EAM, the asset over its life cycle; ERP, maintenance inside the company.
- Choose by the main pain and by who generates the data, not by the acronym.
- Field usability and offline capability matter more than reports.
- Without reliable history, life cycle analysis has no foundation.
- Common order: organized execution, then integration, then asset analysis.
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